Abstract
为明确消落区土壤养分对植物生长的影响,通过室内栽培试验,研究三峡库区秭归消落区土壤3种氮磷水平下4种草本植物—鬼针草(Bidens pilosa)、苍耳(Xanthium sibiricum)、水蓼(Polygonum hydropiper)、藜(Chenopodium album)长势及氮、磷计量特征. 结果表明,消落区土壤中生长的植物氮含量为7.98~19.4 mg/g,磷含量为0.740~3.880 mg/g,氮磷比为3.48~13.70,判别植物生长受氮限制. 外源氮磷的添加促进植物氮、磷含量明显升高,但氮磷比没有明显变化;外源氮磷添加解除植物受氮的限制作用. 4种植物对消落区土壤低氮环境具有一定的适应能力. 比较消落区土壤中4种植物长势,鬼针草生物量、相对生长率、根茎生物量比最高,氮磷养分丰富对鬼针草生长促进作用最明显,表明鬼针草更易于在氮、磷贫乏的三峡库区消落区形成优势群落.;Nitrogen (N) and phosphorus (P) availability limit plant growth in most terrestrial ecosystems. Plastic responses of plants to N and P supply cause variation in biomass and N/P ratios, associated with differences in root allocation, nutrient uptake, biomass turnover and reproductive output. We investigated the growth characteristics and nutrients acquirement of four dominant herb plant species (Bidens pilosa, Xanthium sibiricum, Polygonum hydropiper, and Chenopodium album) sampled from Zigui water-fluctuation-zone of Three Gorges Reservoir by pots cultivation at three N and P levels. In the process of plant growth, we determined plant biomass and nutrient contents of plant tissues. N contents of plant growing in soil ranged in 7.98-19.4 mg/g, and P, ranged in 0.740-3.880 mg/g, and N/P, ranged in 3.48-13.70, which indicated that plants were under N limitation. After N & P supply, N and P contents increased significantly, and plant growth were not limited by N. By comparing the growth characteristics of 4 plant species in soil, the following results were obtained. B. pilosa had significant higher biomass, relative growth rate and root/shoot biomass ratio. After N & P supply, B. pilosa growth were promoted significantly. B. pilosa would be dominant community in soil of poor nutrient level in water-fluctuation-zone of Three Gorges Reservoir.
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Claims 8
Claim · model-written summary
Plants growing in the reservoir water-fluctuation soil had N content of 7.98-19.4 mg/g.
Verbatim
e0“We investigated the growth characteristics and nutrients acquirement of four dominant herb plant species (Bidens pilosa, Xanthium sibiricum, Polygonum hydropiper, and Chenopodium album) sampled from Zigui water-fluctuation-zone of Three Gorges Reservoir by pots cultivation at three N and P levels”
e1“N contents of plant growing in soil ranged in 7.98-19.4 mg/g, and P, ranged in 0.740-3.880 mg/g, and N/P, ranged in 3.48-13.70, which indicated that plants were under N limitation”
Claim · model-written summary
Plants growing in the reservoir water-fluctuation soil had P content of 0.740-3.880 mg/g.
Verbatim
e0“We investigated the growth characteristics and nutrients acquirement of four dominant herb plant species (Bidens pilosa, Xanthium sibiricum, Polygonum hydropiper, and Chenopodium album) sampled from Zigui water-fluctuation-zone of Three Gorges Reservoir by pots cultivation at three N and P levels”
e1“N contents of plant growing in soil ranged in 7.98-19.4 mg/g, and P, ranged in 0.740-3.880 mg/g, and N/P, ranged in 3.48-13.70, which indicated that plants were under N limitation”
Claim · model-written summary
Plant N/P ratio of 3.48-13.70 indicated that plants were under N limitation.
Verbatim
e0“We investigated the growth characteristics and nutrients acquirement of four dominant herb plant species (Bidens pilosa, Xanthium sibiricum, Polygonum hydropiper, and Chenopodium album) sampled from Zigui water-fluctuation-zone of Three Gorges Reservoir by pots cultivation at three N and P levels”
e1“N contents of plant growing in soil ranged in 7.98-19.4 mg/g, and P, ranged in 0.740-3.880 mg/g, and N/P, ranged in 3.48-13.70, which indicated that plants were under N limitation”
Claim · model-written summary
N and P supply significantly increased plant N and P contents.
- Taxon
- four dominant herb plant speciese0
- Treatment
- N & P supplye2
- Outcome
- N and P contentse2
- Direction
- increasede2
Not reportedComparator
Verbatim
e0“We investigated the growth characteristics and nutrients acquirement of four dominant herb plant species (Bidens pilosa, Xanthium sibiricum, Polygonum hydropiper, and Chenopodium album) sampled from Zigui water-fluctuation-zone of Three Gorges Reservoir by pots cultivation at three N and P levels”
e2“After N & P supply, N and P contents increased significantly, and plant growth were not limited by N”
Claim · model-written summary
N and P supply removed N limitation of plant growth.
- Taxon
- four dominant herb plant speciese0
- Treatment
- N & P supplye2
- Outcome
- plant growthe2
- Direction
- not limitede2
Not reportedComparator
Verbatim
e0“We investigated the growth characteristics and nutrients acquirement of four dominant herb plant species (Bidens pilosa, Xanthium sibiricum, Polygonum hydropiper, and Chenopodium album) sampled from Zigui water-fluctuation-zone of Three Gorges Reservoir by pots cultivation at three N and P levels”
e2“After N & P supply, N and P contents increased significantly, and plant growth were not limited by N”
Claim · model-written summary
B. pilosa had significantly higher biomass, relative growth rate and root/shoot biomass ratio than the other species.
- Taxon
- B. pilosa
Bidens pilosae3 - Outcome
- biomass, relative growth rate and root/shoot biomass ratioe3
- Direction
- highere3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“B. pilosa had significant higher biomass, relative growth rate and root/shoot biomass ratio”
Claim · model-written summary
N and P supply significantly promoted B. pilosa growth.
- Taxon
- B. pilosaBidens pilosae4
- Treatment
- N & P supplye4
- Outcome
- growthe4
- Direction
- promotede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“After N & P supply, B. pilosa growth were promoted significantly”
Claim · model-written summary
B. pilosa would form a dominant community in poor-nutrient soil of the water-fluctuation zone.
- Taxon
- B. pilosaBidens pilosae5
- Outcome
- dominant communitye5
- Qualifier
- soil of poor nutrient levele5
- Setting
- water-fluctuation-zone of Three Gorges Reservoire5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“B. pilosa would be dominant community in soil of poor nutrient level in water-fluctuation-zone of Three Gorges Reservoir”
The same questions in other papers
phosphorus · growth · Bidens pilosa (bur-marigold)Positive and negative results
1 in the opposite direction
- negative
nitrogen · growth · Bidens pilosa (bur-marigold)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.